_: prev: {
  lego = prev.lego.overrideAttrs rec {
    version = "4.21.0";
    src = prev.fetchFromGitHub {
      owner = "go-acme";
      repo = "lego";
      rev = "v${version}";
      hash = "sha256-3dSvQfkBNh8Bt10nv4xGplv4iY3gWvDu2EDN6UovSdc=";
    };
    vendorHash = "sha256-teA6fnKl4ATePOYL/zuemyiVy9jgsxikqmuQJwwA8wE=";
  };
}
